A flat-bottomed barge having a \(150 \mathrm{ft} \times 20 \mathrm{ft}\) bottom is towed through still water \(\left(60^{\circ} \mathrm{F}\right)\) at \(10 \mathrm{mph}\). What is the frictional drag force exerted by the water on the bottom of the barge? How long could the laminar portion of the boundary layer be, using a critical Reynolds number of 537,000 ? What is the thickness of the laminar layer at its downstream end? What is the approximate thickness of the boundary layer at the rear end of the bottom of the barge?